Let others be right. — Don't get into pointless arguments over tiny details that don't matter in the bigger scheme of things. Even if you know they're wrong, don't make people look bad by correcting them unnecessarily.

Let others be generous. — Don't say "I already know" when well-intentioned people pass along news that you've already heard. Thank them, as you would if they gave you a small gift of something that you don't need.